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herbalicious74 (December 31, 1969 at 6:59 pm)
lol, how perceptive of you
patmccafferty (December 31, 1969 at 6:59 pm)
She must be very perceptive to recognize two lightning strikes independently. Surely the flashes would overlap into one slightly longer flash. Or its a very long train traveling incredibly fast.. but hey don't get me wrong, if the lady says she saw one before the other then i ain't arguing, a womans always right ;)
UbiDubiumIbiLiberas (December 31, 1969 at 6:59 pm)
Tetrahelix, though ur equations is, obviously, correct, an astute observer with limited understanding of physic would say that it in facts DISproves the point you are trying to make. the other half of the proof is F=ma.(m=mass; a=acceleration) which with your equation becomes;GMm/(r^2)=ma;solving for a you can see little m drops out; meaning the acceleration of an object due to gravity is independent of it's mass
Tetrahelix (December 31, 1969 at 6:59 pm)
techphy100, you cannot compare the accelerations of the Earth and the moon as a defense of your false assertion that lighter objects fall faster because they are being acted upon by gravitational fields of different strengths.The force between the two is F=GMm/(r^2), (M=mass of Earth, m=mass of moon, r=distance between them) any object distance r from the Earth will have a=GM/(r^2) from Earth's gravity and any object distance r from the moon will have a=Gm/(r^2) from the moon's gravity.
techphy100 (December 31, 1969 at 6:59 pm)
Thats not possible, thats an illusion. Smaller objects accelerate faster than larger objects. Hold a tennis ball straight out and turn in a circle, easy, now do it with a bowling ball, harder to get moving. Now, does the moon pull on the earth? If you say the earths g on the moon is 9.8ms2, what is the moons g pull on earth(pertubation)? For larger objects to accelrate at the same rate is too violent, and a beauty of nature that keeps the universe stable.
Tetrahelix (December 31, 1969 at 6:59 pm)
techphy100, it has been showned quite clearly that all objects, when acted upon only by gravity, have the same acceleration in equivalent gravitational fields. We can even observe this through Einstein's General Theory of Relativity, which is based on the premise that different objects in the same gravitational field accelerate at the same rateAlso, LMB222, I believe you mean "moment of inertia" as the the rotational equivalent of mass. Inertia is a very broad term with no specific meaning
LMB222 (December 31, 1969 at 6:59 pm)
"Every object of different mass falls at different rate."WHAT? The more mass (this is what you call 'inertia'), the higher the force is, therefore the acceleration stays the same. Bigger mass, but higher force. And inertia is the equivalent of mass, but in circular motion. [of course we are ignoring friction here]
techphy100 (December 31, 1969 at 6:59 pm)
Also dont forget that everything falls to earth at 9.8ms2, but this is not true. Every object of different mass falls at different rate. before people thought heavier objects fall faster, yesterday we thought all objects fall the same, today we should think heavier objects fall slower than lighter ones because they have more inertia to initiate accleration. Just like a car and a truck accelrating at a green light.
techphy100 (December 31, 1969 at 6:59 pm)
Pulsar89 you have a very good point that everyone fails to question, except me haha, is that somewhere in spacetime the event is correct, where? where the two masses meet as t and d from the reference point approaches zero.This is where time does not exist.Whether the man or the woman, the event has already happened.Pulsar89 is looking at the illusion(spacetime) point of view and Uejji is looking at the macro(time distance) point of view.The man would see the bomb explode first before the lite
Uejji (December 31, 1969 at 6:59 pm)
Then we agree and this argument is fruitless. :> |
